Wavelength selective spin current is generated in the mid infrared rage by combining plasmonic metamaterial absorbers with platinum/yttrium-iron-garnet spintronic devices. The wavelength selectivity is attributed to the plsmonic resonance of the metamaterial absorber.
For more information: https://www.osapublishing.org/abstract.cfm?uri=CLEO_QELS-2018-FF2F.8